Ampicillin-d5 Desoxyazetidin-2-one is deuterium labeled Ampicillin Desoxyazetidin-2-one (A634345), which can be used to develop HPLC methods that detectÂcompounds or impurities related to ampicillin in bulk drug. Ampicillin Desoxyazetidin-2-one is a related compound ofÂAmpicillin (A634300), aÂβ-lactamÂantibiotic used for treating bacterial infection.ÂAmpicillin interferes with cell wall synthesis in bacteria.